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(DOCSP-12450): JS Compatibility Table
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‎source/functions.txt

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- Function memory usage is limited to 256MB.
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- Functions support most commonly used ES6+ features, but some features that are
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uncommon or unsuited to serverless workloads are not supported (e.g.
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``WeakSet``, ``Proxy``, ``Array.prototype.flat()``).
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uncommon or unsuited to serverless workloads are not supported. For more
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information, see :ref:`JavaScript Feature Compatibility <js-feature-compat>`.
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- A function may open a maximum of 5 sockets using the :nodejs:`net
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<docs/v10.18.1/api/net.html>` built-in module.
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* - :doc:`Built-In Module Support </functions/built-in-module-support>`
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- Details which standard Node modules and APIs are available in {+service-short+} functions.
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* - :doc:`JavaScript Feature Compatibility </functions/js-feature-compatibility>`
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- Details the JavaScript syntax and built-ins that are available in {+service-short+} functions.
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.. toctree::
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:titlesonly:
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Function Context Reference </functions/context>
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Utility Packages </functions/utilities>
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JSON & BSON </functions/json-and-bson>
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JavaScript Feature Compatibility </functions/js-feature-compatibility>

‎source/functions/js-feature-compatibility.txt

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.. _js-feature-compat:
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================================
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JavaScript Feature Compatibility
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================================
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.. default-domain:: mongodb
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.. contents:: On this page
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:local:
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:backlinks: none
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:depth: 2
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:class: singlecol
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Overview
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--------
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{+service+} :doc:`functions </functions>` fully support JavaScript ES5 syntax as
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well as most modern JavaScript features included in EcmaScript 2015 (ES6) and
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more recent releases. This page outlines Realm's support for a non-exhaustive
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list of features released in or since EcmaScript 2015.
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Syntax
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------
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.. list-table::
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:header-rows: 1
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:widths: 80 20
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* - Feature
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- Supported
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* - :mdn:`arrow function expressions <Web/JavaScript/Reference/Functions/Arrow_functions>`
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- Yes
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* - :mdn:`classes <Web/JavaScript/Reference/Classes>`
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- Yes
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* - :mdn:`super <Web/JavaScript/Reference/Operators/super>`
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- Yes
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* - :mdn:`generators <Web/JavaScript/Reference/Statements/function*>`
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- Yes
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* - :mdn:`default function parameters <Web/JavaScript/Reference/Functions/Default_parameters>`
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- Yes
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* - :mdn:`rest parameters <Web/JavaScript/Reference/Functions/rest_parameters>`
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- Yes
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* - :mdn:`spread iterables <Web/JavaScript/Reference/Operators/Spread_syntax>`
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- Yes
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* - :mdn:`object literal extensions <Web/JavaScript/Reference/Operators/Object_initializer#New_notations_in_ECMAScript_2015>`
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- Yes
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* - :mdn:`for...of loops <Web/JavaScript/Reference/Statements/for...of>`
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- Yes
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* - :mdn:`for await...of loops <Web/JavaScript/Reference/Statements/for-await...of>`
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- Yes
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* - :mdn:`octal and binary literals <Web/JavaScript/Reference/Lexical_grammar#Binary>`
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- Yes
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* - :mdn:`template literals <Web/JavaScript/Reference/Template_literals>`
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- Yes
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* - :mdn:`destructuring assignment <Web/JavaScript/Reference/Operators/Destructuring_assignment>`
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- Yes
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* - :mdn:`new.target <Web/JavaScript/Reference/Operators/new.target>`
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- Yes
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* - :mdn:`RegExp -y and -u flags <Web/JavaScript/Guide/Regular_Expressions#Advanced_searching_with_flags_2>`
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- No
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* - :mdn:`Exponentiation (**) <Web/JavaScript/Reference/Operators/Exponentiation>`
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- Yes
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Built-In Objects
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----------------
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.. list-table::
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:header-rows: 1
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:widths: 80 20
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* - Feature
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- Supported
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* - :mdn:`TypedArray <Web/JavaScript/Reference/Global_Objects/TypedArray>`
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- Yes
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* - :mdn:`Map <Web/JavaScript/Reference/Global_Objects/Map>`
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- Yes
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* - :mdn:`Set <Web/JavaScript/Reference/Global_Objects/Set>`
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- Yes
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* - :mdn:`WeakMap <Web/JavaScript/Reference/Global_Objects/WeakMap>`
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- Yes
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* - :mdn:`WeakSet <Web/JavaScript/Reference/Global_Objects/WeakSet>`
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- No
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* - :mdn:`Proxy <Web/JavaScript/Reference/Global_Objects/Proxy>`
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- No
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* - :mdn:`Reflect <Web/JavaScript/Reference/Global_Objects/Reflect>`
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- No
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* - :mdn:`Promise <Web/JavaScript/Reference/Global_Objects/Promise>`
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- Yes
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* - :mdn:`Symbol <Web/JavaScript/Reference/Global_Objects/Symbol>`
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- Yes
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Built-In Object Methods & Properties
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------------------------------------
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.. list-table::
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:header-rows: 1
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:widths: 80 20
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* - Feature
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- Supported
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* - :mdn:`Object static methods <Web/JavaScript/Reference/Global_Objects/Object#Static_methods>`
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- Yes
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* - :mdn:`String static methods <Web/JavaScript/Reference/Global_Objects/String#Static_methods>`
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- Yes
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* - :mdn:`String.prototype methods <Web/JavaScript/Reference/Global_Objects/String#Instance_methods>`
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- Yes
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* - :mdn:`RegExp.prototype properties <Web/JavaScript/Reference/Global_Objects/RegExp#Instance_properties>`
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- No
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* - :mdn:`Function.name <Web/JavaScript/Reference/Global_Objects/Function/name>`
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- Yes
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* - :mdn:`Array static methods <Web/JavaScript/Reference/Global_Objects/Array#Static_methods>`
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- Yes
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* - :mdn:`Array.prototype methods <Web/JavaScript/Reference/Global_Objects/Array#Instance_methods>`
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- Yes
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* - :mdn:`Number static methods <Web/JavaScript/Reference/Global_Objects/Number#Static_methods>`
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- No
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* - :mdn:`Math methods <Web/JavaScript/Reference/Global_Objects/Math#Static_methods>`
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- No

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